// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

package logger

import (
	"bytes"
	"fmt"
	"os"
	"path/filepath"
	"time"

	"github.com/kumose/kmopt/pkg/localdata"
	"github.com/kumose/kmopt/pkg/tui"
	"github.com/kumose/kmopt/pkg/utils"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

var debugBuffer *bytes.Buffer

func newDebugLogCore() zapcore.Core {
	debugBuffer = new(bytes.Buffer)
	encoder := zapcore.NewConsoleEncoder(zap.NewDevelopmentEncoderConfig())
	return zapcore.NewCore(encoder, zapcore.Lock(zapcore.AddSync(debugBuffer)), zapcore.DebugLevel)
}

// OutputDebugLog outputs debug log in the current working directory.
func OutputDebugLog(prefix string) {
	logDir := os.Getenv(localdata.EnvNameLogPath)
	if logDir == "" {
		profile := localdata.InitProfile()
		logDir = profile.Path("logs")
	}
	if err := utils.MkdirAll(logDir, 0755); err != nil {
		_, _ = fmt.Fprintf(os.Stderr, "\nCreate debug logs(%s) directory failed %v.\n", logDir, err)
		return
	}

	// FIXME: Stupid go does not allow writing fraction seconds without a leading dot.
	fileName := time.Now().Format(fmt.Sprintf("%s-debug-2006-01-02-15-04-05.log", prefix))
	filePath := filepath.Join(logDir, fileName)

	err := utils.WriteFile(filePath, debugBuffer.Bytes(), 0644)
	if err != nil {
		_, _ = tui.ColorWarningMsg.Fprint(os.Stderr, "\nWarn: Failed to write error debug log.\n")
	} else {
		_, _ = fmt.Fprintf(os.Stderr, "\nVerbose debug logs has been written to %s.\n", tui.ColorKeyword.Sprint(filePath))
	}
	debugBuffer.Reset()
}
